Teenage My Little Pony fan posted heartbreaking YouTube video APOLOGISING to internet trolls who tormented him days before he threw himself under train.Adam Smith, 19, was bullied by internet users over his 'fan fiction'.The teen, who has a learning disability, was upset over plagiarism claim.Adam, who wanted to open a cafe, threw himself under a train.Coroner said some of the comments were 'dangerous in the extreme'.